Improvement in saw-sets



H. G HART.

Saw- Sets.

Patented Oct. 23,1873.

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UNITED STATES PATENT Orrrcn.

HUBERT C. HART, OF UNIONVILLE, CONNECTICUT. V

IMPROVEMENT IN SAW-SETS.

Specification forming part of Letters Patent No. 144,092, dated October28, 1873; application filed 7 August 22, 1873.

To all whom it may concern:

Be it known that I, HUBERT C. HART, of Unionville, Hartford county,Connecticut, have invented certain new and useful Improvementspertaining to Saw-Sets, of which the following is a specification,reference being had to the accompanying drawings, in which Figure 1 is aside view of a saw-set embodying my said improvements. Fig. 2 is a viewof the opposite side of such saw-set. Fig. 3 is a top view of suchsaw-set in the same po sition as in Fig. 1.

The invention consists in the combination of parts set forth in theclaim at the end of this specification, whereby I produce a simple,cheap, and efficient saw-set.

The letter (1. indicates one of the handles of the saw-set, bearing atits forward end the lower or anvil jaw a and the bevel-finger a Theletter b indicates the other handle of the saw-set, its forward endpivoted within a vertical slot in the handle a. The letter b inclicatesthe upper or grasping jaw, pivoted on the pin 1) within the samevertical slot with the handle I), having at the rear a lever end,operating in connection. with the shoulder b on the handle I).

It is not new to use a compound lever in this connection; but mypeculiar arrangement of the end levers is new, and in this connection agreat improvement.

The old arrangement of the compound levers in saw-sets is to have theweight end of the operating handle or lever bear on the power end of thegraspinglever or jaw on that side of the fulcrum of the operating leveror handle which is opposite from the power end of the operating-lever,thus necessitating an undue and unwieldy length of the whole instrument,while by placing the weight of the operating-lever between the fulcrumand the power, I am enabled to considerably shorten up the length of thewhole instrument, and

thus make it more handy; but in order to do this without increasing thevertical thickness of the instrument at the place where the leversco-operate, I have to make the secondary lever, in this c2 so thegrasping-jaw, of peculiar construction. I have to hollow out its underside, so as to make place for the joint or pivot of the primary lever,in this case the handle b.

The letter 0 indicates a spring, preferably spiral, for throwing the twojaws apart. The

tooth of the saw is grasped between the two jaws (0 N. The letter dindicates a balanced oscillating lever-guard, pivoted to the part a onthe pin 4 having a lateral arm, (1 at the rear, through which runs theset-screw 0, its lower end bearing on the top of the handle a, andhaving a lateral arm, d at the front, under which the blade of the sawis placed.

By means of the setscrew e, the position of the guard at is adjusted atpleasure.

The blade of the saw is placed under the guard (1 resting on thebevel-finger a the two handles arethen pressed by the hand of theoperator toward each other, and the two jaws thereby made to grasp thetooth of the saw. This operation tends to lift the body of the blade;but it comes in contact with the arm (7 and, its upward progress beingthus arrested, the tooth is bent to the proper set. The lower down thearm 61 is set the more the tooth will be bent, and in this way the setgiven to the saw-tooth is regulated.

I claim as my invention-- The combination of the handle (1, having thejaw a and finger (R, the handle I), lever b and the oscillatinglever-guard d (1 (P, with its screw 6, the whole constructed, arranged,and designed for operation and use, substantially as described.

HUBEIKT HART. \Vitnesses WM. EDGAR Srnonns, J ornv POLLITT.

